Hydrophilic interaction chromatography using a meter-scale monolithic silica capillary column for proteomics LC-MS

Area of Science:

• Analytical Chemistry
• Chromatography
• Biochemistry

Background:

• Developing advanced separation techniques is crucial for analyzing complex biological samples.
• Existing chromatographic methods face limitations in efficiency and coverage for certain biomolecules.
• Monolithic silica columns offer advantages in permeability and flow dynamics.

Purpose of the Study:

• To develop a meter-scale monolithic silica capillary column modified with urea-functional groups for hydrophilic interaction liquid chromatography (HILIC).
• To evaluate the performance of this novel column for the separation of biological compounds, particularly in proteomics.
• To establish a HILIC-based liquid chromatography-mass spectrometry (LC-MS) system for enhanced proteome analysis.

Main Methods:

• Synthesis of a ureidopropylsilylated monolithic silica capillary column.
• Characterization of column performance, including plate height and permeability.
• Application of the column in HILIC mode for LC-MS analysis of tryptic peptides from human cell lysate.
• Comparison of HILIC-LC-MS with reversed-phase liquid chromatography (RPLC)-LC-MS.

Main Results:

• Achieved a minimum plate height of 12 μm for nucleosides and high permeability (2.1 × 10(-13) m(2)).
• Obtained over 300,000 theoretical plates in HILIC with a 4 m column, a record for HILIC.
• Identified comparable numbers of peptides and proteins using HILIC-LC-MS and RPLC-LC-MS.
• Observed an average 5-fold increase in peak response in HILIC due to high acetonitrile concentration.

Conclusions:

• The ureidopropylsilylated monolithic silica column is highly efficient for HILIC separations.
• HILIC-LC-MS is a valuable complementary technique to RPLC-LC-MS for increasing proteome coverage.
• This approach offers significant advantages for proteomics applications requiring sensitive and comprehensive analysis.